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earthnullschool Arctic Sea Ice News & Analysis The sea ice extent has been quickly growing, and by the end of October, ice covered most of the Arctic Ocean. Overall, the ice extent remained below average for this time of year in the Barents and Kara Seas, as well as within northern Baffin Bay and the East Greenland Sea. Overview of conditions Figure 1. Arctic sea ice extent for October 2021 was 6.77 million square kilometers (2.61 million square miles). The magenta line shows the 1981 to 2010 average extent for that month. Credit: National Snow and Ice Data CenterHigh-resolution image The monthly average extent for October 2021 was 6.77 million square kilometers (2.61 million square miles). Conditions in context Figure 2a. Credit: National Snow and Ice Data CenterHigh-resolution image Figure 2b. Credit: NSIDC courtesy NOAA Earth System Research Laboratory Physical Sciences Laboratory High-resolution image Figure 2c. Credit: NSIDC courtesy NOAA Earth System Research Laboratory Physical Sciences Laboratory High-resolution image Figure 3.